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Adults 18 - 85 years of age\n2. History of:\n\n 1. a verifiable diagnosis of Crohn's disease, ulcerative colitis, or IBD known to be associated with a co-existing condition (such as CTLA4 deficiency or common variable immune deficiency) and which is supported by characteristic clinical features, radiographic or endoscopic findings, or consistent histopathologic mucosal changes related to chronic inflammation; and/or\n 2. a defined genetic syndrome/mutation linked to inflammatory bowel disease risk with or without symptoms or findings consistent with IBD\n3. Presence of a referring community physician who would be able to manage care outside of NIH\n\nUnaffected family member of participant: immediate relative to the enrolled participant (mother, father, sibling, or adult child) may be recruited and enrolled to improve interpretation of genetic results or expand the phenotype of the IBD\n\n1. Adults 18 - 99 years of age\n2. In good general health\n3. No medical diagnosis of IBD\n\nEXCLUSION CRITERIA\n\nAn individual who meets any of the following criteria will be excluded from participation in this study:\n\n1. Unable or unwilling to provide informed consent\n2. 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